RUSTSEC-2020-0071 (CVE-2020-26235)

Vulnerability from osv_rustsec – Published: 2020-11-18 12:00 – Updated: 2024-06-05 14:00 – Source website
VLAI
Summary
Potential segfault in the time crate
Details

Impact

The affected functions set environment variables without synchronization. On Unix-like operating systems, this can crash in multithreaded programs. Programs may segfault due to dereferencing a dangling pointer if an environment variable is read in a different thread than the affected functions. This may occur without the user's knowledge, notably in the Rust standard library or third-party libraries.

The affected functions from time 0.2.7 through 0.2.22 are:

  • time::UtcOffset::local_offset_at
  • time::UtcOffset::try_local_offset_at
  • time::UtcOffset::current_local_offset
  • time::UtcOffset::try_current_local_offset
  • time::OffsetDateTime::now_local
  • time::OffsetDateTime::try_now_local

The affected functions in time 0.1 (all versions) are:

  • time::at_utc
  • time::at
  • time::now
  • time::tzset

Non-Unix targets (including Windows and wasm) are unaffected.

Patches

Pending a proper fix, the internal method that determines the local offset has been modified to always return None on the affected operating systems. This has the effect of returning an Err on the try_* methods and UTC on the non-try_* methods.

Users and library authors with time in their dependency tree should perform cargo update, which will pull in the updated, unaffected code.

Users of time 0.1 do not have a patch and should upgrade to an unaffected version: time 0.2.23 or greater or the 0.3 series.

Workarounds

A possible workaround for crates affected through the transitive dependency in chrono, is to avoid using the default oldtime feature dependency of the chrono crate by disabling its default-features and manually specifying the required features instead.

Examples:

Cargo.toml: 

chrono = { version = "0.4", default-features = false, features = ["serde"] }

chrono = { version = "0.4.22", default-features = false, features = ["clock"] }

Commandline: 

cargo add chrono --no-default-features -F clock

Sources:
- chronotope/chrono#602 (comment)
- vityafx/serde-aux#21

Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "code-execution",
          "memory-corruption"
        ],
        "cvss": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [
            "time::OffsetDateTime::now_local",
            "time::OffsetDateTime::try_now_local",
            "time::UtcOffset::current_local_offset",
            "time::UtcOffset::local_offset_at",
            "time::UtcOffset::try_current_local_offset",
            "time::UtcOffset::try_local_offset_at",
            "time::at",
            "time::at_utc",
            "time::now"
          ],
          "os": [
            "linux",
            "redox",
            "solaris",
            "android",
            "ios",
            "macos",
            "netbsd",
            "openbsd",
            "freebsd"
          ]
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "time",
        "purl": "pkg:cargo/time"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "0.2.0"
            },
            {
              "introduced": "0.2.1-0"
            },
            {
              "fixed": "0.2.1"
            },
            {
              "introduced": "0.2.2-0"
            },
            {
              "fixed": "0.2.2"
            },
            {
              "introduced": "0.2.3-0"
            },
            {
              "fixed": "0.2.3"
            },
            {
              "introduced": "0.2.4-0"
            },
            {
              "fixed": "0.2.4"
            },
            {
              "introduced": "0.2.5-0"
            },
            {
              "fixed": "0.2.5"
            },
            {
              "introduced": "0.2.6-0"
            },
            {
              "fixed": "0.2.6"
            },
            {
              "introduced": "0.2.7-0"
            },
            {
              "fixed": "0.2.23"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2020-26235",
    "GHSA-wcg3-cvx6-7396"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "### Impact\n\nThe affected functions set environment variables without synchronization. On Unix-like operating systems, this can crash in multithreaded programs. Programs may segfault due to dereferencing a dangling pointer if an environment variable is read in a different thread than the affected functions. This may occur without the user\u0027s knowledge, notably in the Rust standard library or third-party libraries.\n\nThe affected functions from time 0.2.7 through 0.2.22 are:\n\n- `time::UtcOffset::local_offset_at`\n- `time::UtcOffset::try_local_offset_at`\n- `time::UtcOffset::current_local_offset`\n- `time::UtcOffset::try_current_local_offset`\n- `time::OffsetDateTime::now_local`\n- `time::OffsetDateTime::try_now_local`\n\nThe affected functions in time 0.1 (all versions) are:\n\n- `time::at_utc`\n- `time::at`\n- `time::now`\n- `time::tzset`\n\nNon-Unix targets (including Windows and wasm) are unaffected.\n\n### Patches\n\nPending a proper fix, the internal method that determines the local offset has been modified to always return `None` on the affected operating systems. This has the effect of returning an `Err` on the `try_*` methods and `UTC` on the non-`try_*` methods.\n\nUsers and library authors with time in their dependency tree should perform `cargo update`, which will pull in the updated, unaffected code.\n\nUsers of time 0.1 do not have a patch and should upgrade to an unaffected version: time 0.2.23 or greater or the 0.3 series.\n\n### Workarounds\n\nA possible workaround for crates affected through the transitive dependency in `chrono`, is to avoid using the default `oldtime` feature dependency of the `chrono` crate by disabling its `default-features` and manually specifying the required features instead.\n\n#### Examples:\n\n`Cargo.toml`:  \n\n```toml\nchrono = { version = \"0.4\", default-features = false, features = [\"serde\"] }\n```\n\n```toml\nchrono = { version = \"0.4.22\", default-features = false, features = [\"clock\"] }\n```\n\nCommandline:  \n\n```bash\ncargo add chrono --no-default-features -F clock\n```\n\nSources:  \n - [chronotope/chrono#602 (comment)](https://github.com/chronotope/chrono/issues/602#issuecomment-1242149249)  \n - [vityafx/serde-aux#21](https://github.com/vityafx/serde-aux/issues/21)",
  "id": "RUSTSEC-2020-0071",
  "modified": "2024-06-05T14:00:17Z",
  "published": "2020-11-18T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/time"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2020-0071.html"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/time-rs/time/issues/293"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Potential segfault in the time crate"
}



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